Grate structure



J. W. HULSON GRATE STRUCTURE May 28, 1929.

Filed June 13 1927 2 Sheets-Sheet l MK awls/wtoz.

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y 28, 1929 J. w. HULSON 1.715.294

GRATE STRUCTURE Filed June 15, 1927 2 Sheets-Sheet 2 Patented May 2 8, 19:?9. I A UNITED STATES JOHN w. Henson, or xnoxux, IOWA, ASSIGNOR 'ro HULSON GRATE COMPANY, 01? xnoxux, IOWA, a coaronarron.

PATENT OFFICE.

GRATE srnuo'runn.

Application filed June 13, 1927. Serial No. 198,538.

The invention relates to improvements in ates designed primarily for burning lignite ifliel, although not restricted to use with such uel. The principal object of the invention is to provide a grate structure through which the fuel cannot sift, yet of such construction as to admit a large quantity of air. A further object is to provide a grate structure embodying fingerbars and finger plates thereon of such novel construction as to pro.- vide the upper surface of thegrate-with alter j nate ridges and grooves, said 3 plates being formed with passages which .admitfair through the side walls of said rldges, sothat no upwardly opening draught inlets are necessary in the grate structure and hence there is little liability of the fuel sifting there- A still further object is to provide a novel arrangement and construction of finger plates, in which eifective provision is made for cooling by air contact, greatly reducing the-danger of warping.

' A still further aim is to provi'de a construc-.

tion which will be rather simple and inexpensive, may be easily manufactured, and will be highly efiicient and desirable.

With the foregoing in view, the inventio resides in the novel subject matter hereinafter described and claimed, the description being supplemented by the accompanying draw lngs.

Fig. 1 is a fragmentary longitudinal section through a portion of a grate constructed in accordance with my invention.

Fig. 2 is a fragmentary top plan view partly in horizontal section on line 22 of Fig. 1. Fig. 3 is a fragmentary side elevation of one of the finger bars and an end elevation ofa numbe'rof the finger plates mounted thereon. c Fig. 4 is a vertical sectional view. on line- Fig. 5 is a perspective view showing twoof the finger plates .separatedfrom each other.-

to more clearly disclose their construction. In the drawings above briefly described, the

numerals 6 designatethe finger bars and 7 denotes the; finger plates thereon. These plates are disposed in vertical planes transverse to the bars 6 and said plates are in su b-' stantial contact with each other. They may be mounted uponthe-bars 6 in any desired] manner, but preferably in accordance with U. S. Patent'1,500,920, issued July'i8, 1924, V

to myself and William F. Bradley. The upper edges of the plates 7 are shaped to provide alternate ridges 8 and grooves.9-

extending longitudinally of the grate structure, that is",'transversely of the finger bars 6.

In the present disclosure, to provide this'al ternateridge and groove construction, I'pro-.

vide each plate 7 with atransversely stepped edge, providing a relatively'hi h step 10 anda comparatively low step 11 r eachplate said ste'psboth extending from end to end of the'plate." As seen in a number of the views, the lowsteps 11 of alternate plates (A) are disposed adjacent the low steps 11 of the intervening plates (I) and the high steps 10 V of said alternate plates are disposed adjacent the high "steps 10 of said intervenin' plates, 'provldlngthe alternate ,ridgean I groove construction.

The high steps 10 have a plurality of draught inletpassages 12 formed therethrough, and the sides of the plates 7 at which "said high stepsare located, are recessed'as at 13, providing vertical air passages leading to edges of the plates. The passages 12. and the recesses 13 of adjacent plates, register with each other as shown most clearly in Fig. 4. The sides of the plates 7 at which the low steps 11 are located are provided with registering recesses 14 to receive air. Thus, this.

air andfthat passing through the passages 'surface. Even this proportion may be @jchangedito obtain a greater amount of air ifjdesired, by constructingthe grate with the -grooves.9 deeper and forming the inlets 12 of greater height. While an abundance of air is admitted through the grate, there is little "liability 'of downward sifting of the fuel therethrough, due to the positioning of the air inlet passagesin the ridges 8 and opening through vertical sides thereof into the grooves 9.

To prevent any sifting of fuel through the grate'at the ends of the plates 7 of any finger 80 the transverse passages 12 from the lower bar, prefer to provide these plates at one suming solid fuel. In any instance, the grate tions may be made. I

is efiicient and in every way desirable.

Excellent results have been obtained from the exact details disclosed and they are therefore preferably followed. However, within the scope of the invention as claimed, varia- 1. In a grate, a finger bar, a plurality of finger plates transverse to and carried by said finger bar, said plates being disposed incontact with each other and having their upper edges shaped to provide alternate ridges-and grooves which extend'longitudinally of said plates, said plates being formed with "draught passages which open through the longitudinal sides of said ridges, and a projecting lipon one end of each plate extending throughout the thickness-of the latter, the lips of said plates being disposed in contact with each other and constituting a continuous flange to underlie ends of other finger plates on an adjacent finger bar, thereby preventing the existence of vertical openings between the .-fin-' ger'plates of-the two finger bars.

2. Ina grate, a finger bar, and a plurality of finger plates transverse to and carried by said bar, the upper edge of each of said plates being transversely stepped to provide each with a relatively high step extending from end to end of the plate and a relatively low step also extending from end to end thereof, the low steps of alternate plates being adjacent the low steps of the interveningplates,

and the high steps of said alternate plates being adjacent the high steps of said inter-' venlng plates, providing alternate ridges and grooves, said plates having transverse draught passages through their high steps opening into said groves, and, when assembled, providing vertical air passageswhose upperends communicate with said transverse passages.

3. In a grate,a finger bar, and a plurality of finger plates transverse to and carried by said ,bar, the upper edges of said plates being transverselystepped to provide each with a relatively highstepextending from end to endof the plate. and a relatively low step also extending from end to end thereof, the'low steps of alternate'plates being adjacent the low steps of the intervening plates, and the high ste s. of said alternate plates being adjacent t e high'steps of said intervening providing alternate ridges and grooves, the contacting high steps of said plates,

plates having transverseregistering draught passages opening into said grooves, contacting sides of said plates being formed with registering draught passages from the lower edges of the plates to said transverse passages.v v

- 4. In a grate, a'finger bar,and a plurality of finger plates transverse to and carried by said bar, the upper edges of saidplates being transversely stepped to provide each with a relatively high step extending from endto end of the plate and a relatively low step also extendingfrom end to end thereof, the low,

steps of alternate plates being. adjacent the lowsteps of the intervening plates, and the high steps of said alternate'plates being adjacent the high steps of said intervening plates, providing alternate ridges and grooves, the contacting high steps of said plates having transverse registering draught passages opening into said grooves, half the v 7 number officontacting sides of said plates being formed with registering draught pas- V sages from the-lower edges of the plates to said transversepassages, the other contacting sides of the plates having registering-spaces to receive air for cooling purposes.

In testimony whereof I have hereunto af fixed my signature.

JOHN WILLIAM 

